Audio interface



FIG. 1 is an upper-right-front perspective view showing the design;

FIG. 2 is a lower-left-back perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left-side view thereof;

FIG. 6 is a right-side view thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof. 

CLAIM I claim the ornamental design for an audio interface, as shown and described. 